10040.00 mg/l sodium level to ppt salinity

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KStatefan

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I just got back my triton icp test results and my sodium is shown to be 1.004 mg/l. Can anyone tell me what that is in ppt?
thanks
Jeff

The number in your subject looks to be the correct one. 10040 mg/l = 10.040 g/l or parts per thousand.
 

Morpheosz

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Are you trying to calculate salinity from the level of sodium?
It's more complicated than that.
I was curious about this as well, as my most recent ICP test showed my sodium to be on the low end of their range, but my salinity as read by freshly calibrated refractometer was actually a bit high when I sent the sample in - close to 36ppt.
 
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gbroadbridge

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It's been discussed previously, and is not simple

 

Randy Holmes-Farley

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copying my response from the duplicate thread:

What do you mean its the only thing relayed to salinity? Magnesium, calcium, sulfate all would be good to know, even if you do not have chloride.

That said, 35 ppt seawater has 10,800 ppm sodium, so if you solution matches NSW in composition, that 10,040 ppm (my guess that you left off a zero) is equivalent to 32.5 ppt.
 
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copying my response from the duplicate thread:

What do you mean its the only thing relayed to salinity? Magnesium, calcium, sulfate all would be good to know, even if you do not have chloride.

That said, 35 ppt seawater has 10,800 ppm sodium, so if you solution matches NSW in composition, that 10,040 ppm (my guess that you left off a zero) is equivalent to 32.5 ppt.
Interesting, my ICP test came back 10310, which would equate to around 33ppt. Interestingly enough that’s exactly what my Apex probe says. I assumed it was off because my refractometer, calibrated with a 35ppt solution, reads 35. Should I assume that my refractometer is off if I have 2 data points including ICP lab test saying 33?
 

Randy Holmes-Farley

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Sodium alone is not adequate to have confidence in salinity calculations unless it is true natural seawater. You need the other major ions as well.
 

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